Putting down my cocaine riddled spliff for a second.
I'd say this is a hole for testing, maybe a sensor is in there.
The blown front wing thing to me is almost ridiculous. just almost; as you never can tell what is possible. But using the little that i know, this is much different than a rear wing, and it doesn't need to be blown; it has as many elements as the team needs and is very open in design.
Putting choked slowed down air behind it through a slit wont solve anything.Might as well bore a hole through the wing in the first place.
The W duct thing makes as much sense as setting a midget in the nose to use his little lung strength to blow though the pylons when the car turns.